Osseo, Wisconsin, sits in USDA hardiness zone 4b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Among the crops suited to this profile: cabbage, cranberry, turkish rocket, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Osseo, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Osseo lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around Osseo — soil, climate, flood, and parcel records. How we handle your address.
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Osseo — the short answer
Osseo, Wisconsin: USDA zone 4b, about 165 days between hard freezes, across 1K acres of city.
- USDA zone
- 4b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 9
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~165
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 1K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 4b is Osseo's average, not your lot's — a low corner or a tree line moves it. Against Osseo's 165-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Osseo
Each reading below is measured for Osseo itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredOsseo runs about 165 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredOsseo sits in USDA hardiness zone 4b.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
The kind of country Osseo is in
Osseo sits in the Driftless Area — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Osseo's own centroid rather than borrowed from Trempealeau County.
What Grows in Osseo
Every plant below cleared Osseo's own zone 4b and its 165-day season. Each card opens that plant's Wisconsin profile. How we score.
Is it too late to plant in Osseo?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 30; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 27 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 9 — long-season crops need about 90 days of runway, quick greens only 30. Late in the year the fall bench takes over — quick greens, radishes, and garlic that repays you next summer.
What's on the federal record near Osseo
Closest first, within ~10 miles of Osseo. Listing isn't leaking, and distance isn't exposure.
- RONGSTADS STANDARD INCBrownfields · 350 ft
- TEDS MARTUnderground Storage Tanks · 750 ft
- MAYO CLINIC HEALTH SYSTEM OAKRIDGE OSSEOBrownfields · 750 ft
- CURTS AUTO BODYBrownfields · 1000 ft
- Superamerica #4523Underground Storage Tanks · 1100 ft
- VERNON NYENUnderground Storage Tanks · 1200 ft
- OSSEO-FAIRCHILD SCHOOL DISTRICTUnderground Storage Tanks · 1400 ft
- OSSEO AREA MUNICIPAL HOSPITALUnderground Storage Tanks · 1500 ft
- UNION 76Underground Storage Tanks · 1600 ft
- Kwik Trip #756Underground Storage Tanks · 1600 ft
- FAMILY DOLLAR #7443Brownfields · 1600 ft
- TR-24/07W/10-0006Nitrate · 1600 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Osseo's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near Osseo.
Total Sites
187
within ~10 miles of Osseo
Risk Level
Moderate
Highest-severity
2 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Osseo
Severity Distribution
within ~10 miles of Osseo
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Osseo, Underground Storage Tanks runs higher than the national average — 130 sites within ~10 miles of Osseo. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Osseo
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the Osseo average
Your land is one point inside Osseo
Everything above resolves to Osseo as a whole — one PHZM band and one 28°F frost record, read across 1K acres. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at city scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the Osseo Average
Osseo Average
- ●USDA Zones 4b, averaged across Osseo
- ●One soil character for all of Osseo
- ●Frost dates read at Osseo's scale: Apr 27 to Oct 9
YOUR Parcel
- ✓Your exact zone, not Osseo's 4b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Osseo
Pull a site-specific report for your exact address in Osseo, Wisconsin — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Osseo averages can't show:
We read public map data around Osseo — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Osseo average
How we know this about Osseo
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Osseo’s own record; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at city grain anywhere on this page — there is no city-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about Osseo
When does frost risk typically end in Osseo?
The last hard freeze (28°F) in Osseo typically lands around Apr 27, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about May 18.
When is the first frost in Osseo?
The first hard freeze (28°F) in Osseo typically arrives around Oct 9, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 25, so the watching starts about Sep 9 — about 165 days after the spring freeze cleared.
How long is the growing season in Osseo?
Measured between 28°F hard freezes, Osseo sees about 165 frost-free days — roughly Apr 27 through Oct 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 18 to Sep 25, about 130 days.
Is the soil safe to grow vegetables in Osseo?
The federal record around Osseo shows 187 documented sites, mostly Underground Storage Tanks entries (130), the nearest Brownfields record under a tenth of a mile out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Osseo?
From about Sep 9 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Oct 9 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Oct 9. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Osseo's scale — its 4b band and its 165-day season. Your yard writes its own version of Osseo's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at Osseo’s own scale
6 of the readings below were taken at Osseo's own scale — its own ~165-day season between 28°F freezes, the 1,317 acres it covers and 187 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Osseo's own USDA hardiness band, zones 4bUSDA PHZM 2023
- Osseo's own 28°F hard-freeze dates, about Apr 27 and Oct 9 and the ~165-day span between themNOAA 1991–2020 Climate Normals
- 187 documented contamination sites on the federal record near Osseo, the closest Brownfields record under a tenth of a mile out from the town centreFederal environmental registers
- Osseo's boundary and the 1,317 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4b and a ~165-day seasonGrowable Ground crop-matching engine
- The ecoregion at Osseo's own centroid, the Driftless AreaUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Osseo's 1,317 acres read through its county's SSURGO summaryfrom Trempealeau County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Trempealeau County
- The growing challenges every Wisconsin grower plans around — written at state scale, so they stay on the state guidefrom Wisconsin
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Trempealeau County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Osseo's 1,317 acreswhy one lot differs from the next →
- Which side of Osseo you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,317 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record under a tenth of a mile out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any Osseo-wide figureread your own land →
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